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Fix tail call support in VC++ builds

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llvm-svn: 22143
This commit is contained in:
Jeff Cohen 2005-05-20 01:35:39 +00:00
parent 1751711b06
commit a0f463a25c
1 changed files with 45 additions and 38 deletions
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83
lib/Target/X86/X86JITInfo.cpp
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@ -28,45 +28,56 @@ void X86JITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
}
#ifdef _MSC_VER
#pragma optimize("y", off)
#endif
/// JITCompilerFunction - This contains the address of the JIT function used to
/// compile a function lazily.
static TargetJITInfo::JITCompilerFn JITCompilerFunction;
// Provide a wrapper for X86CompilationCallback2 that saves non-traditional
// callee saved registers, for the fastcc calling convention.
extern "C" void X86CompilationCallback(void);
#if defined(__i386__) || defined(i386)
extern "C" {
#if defined(__i386__) || defined(i386) || defined(_M_IX86)
#ifndef _MSC_VER
asm(
".text\n"
".align 8\n"
".globl X86CompilationCallback\n"
"X86CompilationCallback:\n"
"pushl %ebp\n"
"movl %esp, %ebp\n" // Standard prologue
"pushl %eax\n"
"pushl %edx\n" // save EAX/EDX
"call X86CompilationCallback2\n"
"popl %edx\n"
"popl %eax\n"
"popl %ebp\n"
"ret\n");
void X86CompilationCallback(void);
asm(
".text\n"
".align 8\n"
".globl X86CompilationCallback\n"
"X86CompilationCallback:\n"
"pushl %ebp\n"
"movl %esp, %ebp\n" // Standard prologue
"pushl %eax\n"
"pushl %edx\n" // save EAX/EDX
"call X86CompilationCallback2\n"
"popl %edx\n"
"popl %eax\n"
"popl %ebp\n"
"ret\n");
#else
// FIXME: implement this for VC++
extern "C" void *_AddressOfReturnAddress(void);
#pragma intrinsic(_AddressOfReturnAddress)
void X86CompilationCallback2(void);
_declspec(naked) void X86CompilationCallback(void) {
__asm {
push eax
push edx
call X86CompilationCallback2
pop edx
pop eax
ret
}
}
#endif
#else
// Not an i386 host
void X86CompilationCallback() {
assert(0 && "This is not a X86, you can't execute this!");
abort();
}
// Not an i386 host
void X86CompilationCallback() {
assert(0 && "This is not a X86, you can't execute this!");
abort();
}
#endif
}
/// X86CompilationCallback - This is the target-specific function invoked by the
/// function stub when we did not know the real target of a call. This function
@ -74,14 +85,14 @@ void X86CompilationCallback() {
/// compiler function.
extern "C" void X86CompilationCallback2() {
#ifdef _MSC_VER
// FIXME: This needs to go up one more level!
unsigned *StackPtr, RetAddr;
__asm mov StackPtr, ebp;
__asm mov eax, DWORD PTR [ebp + 4];
__asm mov RetAddr, eax;
assert(sizeof(size_t) == 4); // FIXME: handle Win64
unsigned *RetAddrLoc = (unsigned *)_AddressOfReturnAddress();
RetAddrLoc += 3; // skip over ret addr, edx, eax
unsigned RetAddr = *RetAddrLoc;
#else
unsigned *StackPtr = (unsigned*)__builtin_frame_address(1);
unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(1);
unsigned *RetAddrLoc = &StackPtr[1];
// NOTE: __builtin_frame_address doesn't work if frame pointer elimination has
// been performed. Having a variable sized alloca disables frame pointer
@ -89,7 +100,7 @@ extern "C" void X86CompilationCallback2() {
alloca(10+(RetAddr >> 31));
#endif
assert(StackPtr[1] == RetAddr &&
assert(*RetAddrLoc == RetAddr &&
"Could not find return address on the stack!");
// It's a stub if there is an interrupt marker after the call.
@ -123,13 +134,9 @@ extern "C" void X86CompilationCallback2() {
}
// Change the return address to reexecute the call instruction...
StackPtr[1] -= 5;
*RetAddrLoc -= 5;
}
#ifdef _MSC_VER
#pragma optimize( "", on )
#endif
TargetJITInfo::LazyResolverFn
X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
JITCompilerFunction = F;